The official URL structure is: https://archive.mozilla.org/pub/firefox/releases/
If you are running Windows 7, consider upgrading to a more modern, supported version of Firefox or a different browser that still provides security updates for older operating systems.
Select your preferred language (e.g., en-US for US English). Download the Firefox Setup 52.9.0esr.exe file. Run the installer and follow the on-screen instructions. Key Technical Aspects for Users firefox version 52.9. 0 esr download
Technically, yes, but you should not do it. Windows 11 requires modern security standards. Running an outdated browser on a modern OS is extremely dangerous.
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Mozilla maintains an official directory of every Firefox release since version 0.8. Do download from third-party "old version" websites, which often bundle malware.
Firefox 52.9.0 ESR will immediately try to connect to Mozilla servers to update to the next available ESR generation. To prevent this: The official URL structure is: https://archive
This software is no longer supported by Mozilla. It contains known, unpatched security vulnerabilities. Only download it for offline use, legacy intranet applications, or air-gapped systems.